SimScale has a great potential. Onshape was great when I started but with the environment is slightly different from standard and buggy. Once Autodesk Fusion 360 was released, I had no second thoughts on shifting to it from Onshape especially due to required features and familiarity.
As a professional, I think the SimScale features pertaining to the nonlinear FEM part is a little out of date. It works great for linear FEM but features related to nonlinear FEM is nearly a decade old.
Hyperelasticity, plasticity, creep are really basic. Damage & fracture are non-existent. Contact is limited to small deformations. Most large aspect-ratio structures, commonly found in sectors like aerospace etc, need truss-beam-plate-shell models. I saw that this feature will be coming soon. Advanced materials like composite toolbox are something that is a definite must have for a professional FEM software. Lastly, most professionals would like to have at least an option to use their own material model (or routine).
I am sure you guys have this on your radar already. But just my 2 cents on the topic.